the fbi interviewed tamerlan and his family members, but we don't know which family members. what we know is they didn't find anything suspicious. no proof of terrorist activity so they cleared him and losed the case. and closed the case. they told the foreign government who was inquiring that if they were ever worried about tamerlan again they should bring it to the fbi's attention again and they would follow-up once more. that government never followed up again and that was two years ago. early last year we know that tamerlan traveled with a kir swrik stan passport to see his father in russia and pes physically chechnya. of a -- after a few months he returned to set up a youtube account and he used it to post and promote radical jihad clips. we heard from the dad he was visiting. he said he thinks his sons are being set up. we don't know how he plays into this. we don't know the motive behind monday's marathon bombing in boston was to promote chechen causes. authorities at this point say the motive is wide open. >> peter, thanks. >>> police in massachusetts are waiting to i